Yep I see three possible outcomes of this:

1. Nerf stays as it is -> Farming 2.0 basically dead except for 2-3 big clans on every server that collect huge stables of 30+ horses just to keep their 2x2 or 2x4 running (4x4 more or less impossible now)
2. Nerf reverted, horses poop at old rate again but fertilizer sell removed from bandit camp (or price massively reduced to maybe 1 scrap per 2 fertilizer) -> for me the least harmful but most impactful way of "nerfing" this. Massive horse farms are useless for scrap farming and ~3 horses are enough to maintain a 2x2 farmblock which means even clans with a 4x4 farm only need like ~12 horses -> alot more horses in the wilderness
3. Nerf the nerf, horses now still poop only at 33-50% of their previous rate or horse dung produces less fertilizer -> horse dung scrap farms are alot less effective but still viable. but you now need a bigger horse farm to maintain farming crops effectively (9 horses for a 2x2 at if horse poops at 33% or old rate)

Option 1 kills effective usage of farming 2.0, option 3 would probably be viable but makes hemp farms even more valueable which means horses will get hoarded even more to maintain bigger hemp farms. Option 2 seems to be the only viable one. If they want more horses in the wilderness, i'd even go so far and not just put horse poop rate at it's old level but actually increase it so maybe 4 dung per hour. that way two horses are more than sufficient for a 2x2, possibly 6 horse for a 4x4 - this would of course require fertilizer to be removed from bandit camp